<style>
    .show-grid {
        margin-bottom: 15px;
    }

    .show-grid [class^="col-"] {
        padding-top: 10px;
        padding-bottom: 10px;
        background-color: var(--white);
        border: 1px solid var(--primary);
    }
</style>
<div class="bny-card">
    <div class="bny-card-header">
        栅格系统
    </div>
    <div class="bny-card-body">
        <div class="row row-no-gutters show-grid">
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
            <div class="col-md-1">.col-md-1</div>
        </div>
        <div class="row row-no-gutters show-grid">
            <div class="col-md-8">.col-md-8</div>
            <div class="col-md-4">.col-md-4</div>
        </div>
        <div class="row row-no-gutters show-grid">
            <div class="col-md-4">.col-md-4</div>
            <div class="col-md-4">.col-md-4</div>
            <div class="col-md-4">.col-md-4</div>
        </div>
        <div class="row row-no-gutters show-grid">
            <div class="col-md-6">.col-md-6</div>
            <div class="col-md-6">.col-md-6</div>
        </div>
    </div>
</div>